Surface Nanocrystallization and Amorphization of Dual-Phase TC11 Titanium Alloys under Laser Induced Ultrahigh Strain-Rate Plastic Deformation
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ID: 112154
2018
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Abstract
As an innovative surface technology for ultrahigh strain-rate plastic deformation, laser shock peening (LSP) was applied to the dual-phase TC11 titanium alloy to fabricate an amorphous and nanocrystalline surface layer at room temperature. X-ray diffraction, transmission electron microscopy, and high-resolution transmission electron microscopy (HRTEM) were used to investigate the microstructural evolution, and the deformation mechanism was discussed. The results showed that a surface nanostructured surface layer was synthesized after LSP treatment with adequate laser parameters. Simultaneously, the behavior of dislocations was also studied for different laser parameters. The rapid slipping, accumulation, annihilation, and rearrangement of dislocations under the laser-induced shock waves contributed greatly to the surface nanocrystallization. In addition, a 10 nm-thick amorphous structure layer was found through HRTEM in the top surface and the formation mechanism was attributed to the local temperature rising to the melting point, followed by its subsequent fast cooling.
| Reference Key |
luo2018materialssurface
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| Authors | Sihai Luo;Liucheng Zhou;Xuede Wang;Xin Cao;Xiangfan Nie;Weifeng He;Luo, Sihai;Zhou, Liucheng;Wang, Xuede;Cao, Xin;Nie, Xiangfan;He, Weifeng; |
| Journal | Materials (Basel, Switzerland) |
| Year | 2018 |
| DOI |
10.3390/ma11040563
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